{"message":"欢迎使用API测试服务！","time":"2026-05-09T13:10:25.520447","endpoints":["GET / - 首页","GET /health - 健康检查","GET /items - 获取所有商品","GET /items/{item_id} - 获取指定商品","POST /items/{item_id} - 创建商品","DELETE /items/{item_id} - 删除商品"]}